package com.ruoyi.web.controller.common;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruoyi.common.utils.file.WatermarkedMultipartFile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.framework.config.ServerConfig;

/**
 * 通用请求处理
 * 
 * @author ruoyi
 */
@RestController
@RequestMapping("/common")
public class CommonController
{
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    private static final String FILE_DELIMETER = ",";

    /**
     * 通用下载请求
     * 
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求时添加水印（单个）
     */
    @PostMapping("/uploadFileAddWaterMark")
    public AjaxResult uploadFileAddWaterMark(MultipartFile file,
                                             @RequestParam(required = false) String xaddress,
                                             @RequestParam(required = false) String xsurveyor,
                                             @RequestParam(required = false) String xlocation,
                                             HttpServletRequest request) throws Exception
    {
        File tempFile = null;
        File watermarkedFile = null;

        try
        {
            // 从请求头中获取水印信息
            String address = StringUtils.defaultIfEmpty(xaddress, "未知地址");
            String surveyor = StringUtils.defaultIfEmpty(xsurveyor, "匿名用户");
            String location = StringUtils.defaultIfEmpty(xlocation, "未知位置");
            String currentDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());

            // 临时保存原始文件
            tempFile = File.createTempFile("upload_", "_temp");
            file.transferTo(tempFile);

            // 添加水印
            watermarkedFile = new File(addImageWatermark(tempFile, address, location, surveyor, currentDate));
            if (!watermarkedFile.exists()) {
                log.error("水印文件生成失败");
                return AjaxResult.error("水印文件生成失败");
            }

            // 使用自定义的 MultipartFile 实现来包装水印文件
            MultipartFile watermarkedMultipartFile = new WatermarkedMultipartFile(watermarkedFile, file.getOriginalFilename());


            // 上传文件
            String filePath = RuoYiConfig.getUploadPath();
            String fileName = FileUploadUtils.upload(filePath, watermarkedMultipartFile);
            String url = serverConfig.getUrl() + fileName;

            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        } finally {
            // 清理临时文件
            try {
                if (tempFile != null && tempFile.exists()) {
                    boolean deleted = tempFile.delete();
                    if (!deleted) {
                        log.warn("临时文件删除失败: {}", tempFile.getAbsolutePath());
                    }
                }
                if (watermarkedFile != null && watermarkedFile.exists()) {
                    boolean deleted = watermarkedFile.delete();
                    if (!deleted) {
                        log.warn("水印文件删除失败: {}", watermarkedFile.getAbsolutePath());
                    }
                }
            } catch (Exception e) {
                log.warn("清理临时文件时发生异常: {}", e.getMessage());
            }
        }
    }



    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files)
            {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + FileUtils.stripPrefix(resource);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 为图片添加水印
     */
    private String addImageWatermark(File file, String address, String location, String surveyor, String date) throws IOException {
        // 生成带时间戳的水印文件名
        String watermarkedPath = file.getAbsolutePath() + "_" + System.currentTimeMillis() + ".jpg";

        try {
            // 构建水印文本
            String watermarkText = String.format("位置: %s\n详细位置：%s\n用户: %s 日期: %s",
                    address , location, surveyor, date);

            // 读取原始图片
            BufferedImage originalImage = ImageIO.read(file);
            if (originalImage == null) {
                throw new IOException("无法读取图片文件");
            }

            // 创建水印图片
            BufferedImage watermarkedImage = new BufferedImage(
                    originalImage.getWidth(),
                    originalImage.getHeight(),
                    BufferedImage.TYPE_INT_RGB);

            // 绘制原始图片
            Graphics2D g = (Graphics2D) watermarkedImage.getGraphics();
            g.drawImage(originalImage, 0, 0, null);

            // 根据图片大小计算字体大小 (图片高度的2%-3%)
            int baseFontSize = Math.max(12, originalImage.getHeight() / 60); // 最小12px
            Font watermarkFont = new Font("微软雅黑", Font.BOLD, baseFontSize);
            g.setFont(watermarkFont);

            // 计算水印位置和大小
            FontMetrics metrics = g.getFontMetrics();
            String[] lines = watermarkText.split("\n");
            int textHeight = metrics.getHeight() * lines.length;
            int textWidth = 0;
            for (String line : lines) {
                textWidth = Math.max(textWidth, metrics.stringWidth(line));
            }

            // 计算动态边距 (图片宽高的2%-5%)
            int minPadding = 5; // 最小边距
            int hPadding = Math.max(minPadding, originalImage.getWidth() / 50);
            int vPadding = Math.max(minPadding, originalImage.getHeight() / 50);

            // 计算水印背景位置 (左下角)
            int bgX = hPadding;
            int bgY = originalImage.getHeight() - textHeight - vPadding * 2;

            // 计算水印背景大小
            int bgWidth = textWidth + hPadding * 2;
            int bgHeight = textHeight + vPadding * 2;

            // 绘制白色背景 (半透明)
            g.setColor(new Color(255, 255, 255, 200)); // 白色带透明度
            g.fillRect(bgX, bgY, bgWidth, bgHeight);

            // 设置蓝色字体
            g.setColor(new Color(0, 0, 255, 220)); // 蓝色带透明度
            AlphaComposite alphaComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.9f);
            g.setComposite(alphaComposite);

            // 绘制水印文本
            int textX = bgX + hPadding;
            int textY = bgY + vPadding + metrics.getAscent();

            // 绘制多行水印文本
            for (int i = 0; i < lines.length; i++) {
                g.drawString(lines[i], textX, textY + (metrics.getHeight() * i));
            }

            g.dispose();

            // 保存水印图片
            ImageIO.write(watermarkedImage, "jpg", new File(watermarkedPath));

            return watermarkedPath;
        } catch (Exception e) {
            // 删除可能已创建的部分文件
            File watermarkFile = new File(watermarkedPath);
            if (watermarkFile.exists()) {
                watermarkFile.delete();
            }
            throw new IOException("添加水印失败: " + e.getMessage(), e);
        }
    }
}
